Dr. Deborah J. Mayhew is owner and principal of Deborah J. Mayhew & Associates, a consulting firm based in Massachusetts, offering courses and consulting on all aspects of Usability Engineering and user interface design. Clients include American Airlines, AT&T, Ford,Harvard Univeristy, and NASA. Dr. Mayhew received her Ph.D. in Experimental Cognitive Psychology from Tufts University. She is the author of Principles and Guidelines in Software User Interface Design (Prentice Hall), a coeditor of Cost-Justifying Usability (Academic Press), and a contributor to Human Factors and Web Development.